Utterly disgusted

So I've asked my wife to purchase a few things at Superspar in Gelvandale amongst the items there was wors which she made for supper seeing that it's Friday and we don't generally cook on Friday's,anyways getting back to the topic the wors that she purchased had a nasty smell of dead flash as it worsened while in the pan, expecting to eat as soon as I get home from work to my disappointment instead I had to come home to the off smell of meat and take a walk back to spar to return it,making me more angry,when I arrived at the store the manager wasn't on duty however there were two *********** supervisor's who asked what are you going to do,are you going to take something else, without saying sorry for the inconvenience caused like it was a house shop,I then exchanged it for burgers and still to no avail when approaching the point of sale no one apologized,I didn't want to cause a scene or take it up on social media but felt like I needed at the very least an apology, because if eaten my family would of had food poison